Feedism certainly encompasses a spectrum. Where one identifies oneself on the spectrum can change. How one gets off sexually within it can change. The intensity and/or clarity of how strongly a person feels this is an inseparable part of who they are usually varies over time. (It might start off more casual or fantasy-based and turn into a lifestyle.) But generally speaking, it’s not something that goes away.

tl;dr
As a doctor, a scientist, and your attorney, I strongly advise you to eat 16 doughnuts a day. 😉

Personally, my fupa became pretty pronounced and fairly deep (enough to engulf most of me flaccid and some of me erect) after I gained about 100 lbs… but I’m very short plus I was looking to gain fat and not muscle so YMMV.

Find a full-time food delivery person who is also a feeder. Endless quantities of tasty food delivered directly into my mouth. Getting fatter and fatter until I’m barely mobile…

I was going to write something similar but you saved me the trouble. After reading and rereading the OP, the “worst” I could say if I was forced to is it comes across as a little voyeuristic—but I would not personally characterize it as cringey, creepy, or “rapey” as it has been during the course of this thread. I do believe some of the comments have been the product of underthinking or overthinking what started as a simple and fairly innocuous topic.

“Why are people so angry at fat acceptance movements on the internet?”

The anger and intolerance on the internet are amplified extensions/reflections of the pervasive attitude in real life that being fat is unacceptable, (for various reasons). This attitude is an “acceptable” prejudice among many.
In my limited experience, even people I would otherwise consider broad-minded, kind, and intelligent may possess this mentality.

1. Do you ever regret it?
Yes.
2. Do you frequently regret it?
No.
3. Do you have mixed feelings about it?
Yes. Only in a social vacuum fantasy world would I not feel conflicted.
4. If you had it to do over, would you still do it?
Excellent question. Yes. My desire to get fat and fatter is just too strong to suppress.
5. If you had it to do over, would you have started gaining even sooner?
I actually did try to gain several times when I was younger, with minimal success. It wasn’t until I was about 30 that I committed myself to gaining 100+ pounds, and was eventually successful.
6. Do you plan to gain more in the future, stay the same or lose weight? Or are you just going to see what happens?
My life circumstances changed dramatically a year ago. I’m just going to see what happens.

Absolutely. I’m quite fascinated by sexual dimorphism and human secondary sex characteristics, not to mention weight gain and fatness of course. To actually see your further physical development (i.e. where the fat goes) would be awesome.

Don’t you love those sudden and somewhat shocking experiences, events, and realizations which remind you of how fat you’ve grown?

-Counselor Deanna Troi eating triple-chocolate ice cream:

“…it's not just a matter of taste. It's the whole experience.
First of all, you have to spoon the fudge around the rim, leaving only the ice cream in the middle. Then, you gently spoon the ice cream around the sides, like you're sculpting it.
Relish every bite.
Make every one an event.
And then, with the last spoonful, close your eyes...”

One of the best things about getting fat is playing with it. My formerly thin body is now pretty well padded with a layer of soft, jiggly, squishy fat which is both fun and erotic to play with. Plus it’s always with me, so there’s the convenience factor.

One of the worst things about getting fat is adjusting to and dealing with anti-fat bias, from casual teasing, to judgments and assumptions, to insensitive or even downright cruel remarks, etc. That can be challenging.